Manufacture of artificial-stone blocks



UNrTED STATES i PATENT @Enron JAMES STANDWOOI) PEIRCE, OF MINNEAPOLIS,MINNESOTA.

MANUFACTURE OF ARTlF!ClAL=STONE BLOCKS.

SPECIFICATION forming part of Letters Patent No. 378,715, dated February28, v18.88.

Application filed June 8, 1885.

To @ZZ whom z5 may con/cern:

Be it known that I, JAMEs STANDwooD PEIRoE, a citizen of the UnitedStates, residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements in theManufacture of Artificial-Stone Blocks; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My inventicn relates to artiiicial-stonebuilding-blocks, and has for itsobject to construct the stone made of the ingredients and in the mannerset forth in my patent of July 31, 1883, N o. 282,219, so that the stoneblock will have through it a space for the circulation of air to preventthe settling or appearance of moisture on the surface or face of thestone, as is the case with most artiicialstone blocks where the stone isformed without the air-space.

I do not claim a hollow building-block, as my block is solid with anair-space through it from side to side, so that when the blocks arebuilt into a wall with one above the other the air-space of one stonewill be over and in con1- munication with the other from the lower tothe upper portion of the wall.

The stone block is usually formed with one air-space through it; butthere may be more than one formed in a like manner.

In carrying out the invention there is usually used a mold with a corethrough the same to form the air-space, the said core serving to aid inholding the sides ofthe mold together, and being withdrawn when the moldis to be taken from the block. For illustration, the size of this coremay be fourteen inches long and four (4.) inches by three (3) inthickness and breadth to a cubic foot of stone. The dimensions of thecore, however, may be varied.

Having stated the invention generally, I will now proceed to describethe same more in detail, and particularly specify the same in theclaims, reference being had to the accompanying drawings, in which-Figure l is a vertical section through the mold and composite block.Fig. 2 is a perspective view with one of the sides of the mold removed.Fig.-3 ish perspective ofthe molded block,a

Serial No. 168,056. (No model) In the drawings, the letter A designatesthe mold,composed of a base, B, formed with strips a on its inner face,which strips are peveled from the upper edges downwardly and in- Wardly,so as to forni beveled edges to the face of the composite block. On thisbase, against the outside of strips a, rest the two sides C of the mold,formed on their inner faces with vertical grooves or ways b, and theends D, which fit into the grooves or ways Z1 of the sides, also restupon the base in like manner. The sides C are also formed with openingsc, so that one opening will be directly opposite to the other, in orderthat a core, E, may pass through both from one side to the other. Thiscore is of such length that it will, when in position, eX- tend beyondboth sides of the box, and its ends are formed with holes d for thepassage of pins F, which draw the sides tightly against the' ends of theend pieces, D, and thus clamp the four sides of the mold tightlytogether, and also hold the core in place. If desired, any otherwelhknown clamping meansmay be used in addition, and for that purposeslots e are made in the corners ofthe mold, as shown, so as to receiveany suitable band. The mold so constructed is filled with thecomposition to form the stone block. l

The composition used is composed of cement, silicious sand, gravel orbroken stone, calcined lime, powdered porcelain, and silicate of soda orpotash, compounded as fully set forth in my Letters Patent of July 31,1883, No. 282,219, to which reference is made for a more full and exactdescription thereof. The composition so prepared is placed in the moldand prop` erly tamped to make the particles close and compact in theirunion, and after the composite block has sufficiently hardened for theremoval of the mold one of the pins to the core is taken out and thecore withdrawm after which the two sides C are taken oft, and then theend pieces, D, lifted away, and the composite block is ready to be takenfrom off the base B, when it appears as seen in Fig. 3.

Instead of lling in the composition over the core, it may be lled in upto the plane of the lower face of the core, and then the core beinserted and the composition lled in over it.

The core may be either the same dimensions from end to end or tapered,as desired.

' roo The buildingbloek made and applied as described forms a strong andsubstantial Wall, on which the moisture so objectionable and so commonlyappearing in artificial-stone building-blocks is prevented from forming.

Having described myinvention and set forth its merits, what I claim isl.The mold for making artificial stone blocks, composed of removable sidesand base, strips o, and a removable core to extend through oppositesides of the mold and be removed without removal of the sides,substantially as described.

2. The combination of the base, the side pieces 37ans formed withopenings opposite to each other I5 and having Ways or grooves formed intheir inner faces, the end pieces fitting into said Ways, and theremovable core passed through the openings in the side pieces andsecured by pins passing through their ends, substantially .2o asdescribed.

In testimony whereof I affix my signature in presence of two Witnesses.

JAMES STANDWOOD PEIRCE.

Witnesses:

CHAs. H. GILMAN, J. B. BERRY.

